Several PC manufacturers today announced battery recalls and Sony's 2.15Ah Li-Ion cells is part of this recall. Here is more info:

Sony Corporation will support voluntary recalls announced today by various PC manufacturers and the U.S. Consumer Product Safety Commission, encompassing about 35,000 notebook battery packs in the U.S., with an additional 65,000 sold worldwide.

Affected PC manufacturers have collectively reported 40 incidents globally of overheating associated with these recalls -- some of which included smoke and/or flames. Sony was informed that four incidents involved small burns and 21 included minor property damage. Reportedly, 19 of these overheating incidents occurred in the U.S.

It is believed that most of these incidents were related to manufacturing line adjustments made from October 2004 to June 2005, which may have affected some battery cells produced during that period. In addition, there were some incidents that may have involved a raw material flaw.

The Sony 2.15Ah lithium ion cells are a different type of cell from those covered by the much larger recalls and replacement programs that certain PC manufacturers announced in 2006.

Sony VAIO notebook computers also use different battery cell types, so they are not part of these recalls.